Die-retainer.



L. G. FISCHER.

v DIE RETAINER.

APPLIUATION FILED JUNE 12, 1907.

Patented Apr. 6, 1909.

Y LOUIS e. FISCHER, or HARRISBURQPENNSYLVANIA.

"im:RETAINERl Specification of Letters Patent.

Patented April 6, 190.9.

Application led June 12, 1907. Serial No. 378,598.

y ToA allwhope 'it may concern:

it` known that I, LOUIS Gr. FISCHER, a

Y 'citizen of the. United States, residing at Har- ':risbi1rg,'inthe county of Dauphin, State of "'`f5'5lennsylvania, have invented certain new "and-useful Improvements in Die-Retainers and 'I ldo hereby declare the following f to benly full, clear, ,and exact description of .l V'the invention, such as 'will enable4 others Z skilled in the art to which it appertains to -make and use the same.

The present invention relates to new and useful improvements in pneumatic riveting machines, and .it has particularly reference 15 to a die Iretaifneremployed in connection 'therewlth, which retainer is designed for effectively holding the die against displacement from the hammer barrel, and is assembled in connection with a means for returning the die to normal positionafter each actuation thereof. l v In connection with a device of the above type, the invention aims as a primary Vobject to provide a novel, construction, combina-I tion and arrangement of parte, the details of which will appear in the course of the fol- Y lowing description in which reference is had vthe accompanyingfdrawings forming a parlifof this specification, like characters of V39 reference designating similar parts throughgout-the several views, wherein Figure 1 is a centrall longitudinal section illustrating the inventionjn its preferred .Qembodimenigand Fig. 2 is a similar View :;i1lustrating a modified embodiment thereof.

' `Referring specifically to the accompany- AingQdrawings,the numeral 1 designates the V barrel of the hammer (the latter not shown) `The barrel lfis formed adjacent its end with a geimumscribing groove 2 in .which is engaged thecrimp'ed edge portion' .of an annular sleeve f5," thelatter being preferably con- ,"structed` of sheet metal and being formed Y with longitudinal slots 6, extending from a '45 pointin its body portion to the upper edge thereof-and aii'ording a plurality of resilient 'pingfingers 7. The sleeve 5 at its outer eli-sis formed with a recurved flange 8, aifordilg a'seat forpan expansive coil spring 60 A9,theinner end of which is engaged in simi- .,l'a'r lianges 11 provided upon semi-annular 1nembers'-12 which together form a sleeve 'surrounding the 'sprintf 9. The members 12 are'veachv formed at ad3acent ends with a recesa13'and avtongue 14, the tongue of one engagingin the recess of, the other as is indicated by the dotted lines of F l. Said members are likewise formed with registering grooves 15 in which is engaged a- Vupon the rivet die 21, the latter working in the hammer barrel 1. Y

In use, each blow of the hammer forces vthe die 2l outwardly from the barrel and in such movement Aof the die the members12 are moved to compress the spring which restores the to normal position after each actuation thereof.

In Fig. 2 the departure resides .in elim. -inating the sleeve `5 and in substituting therefor a collar 22 havinga grooved face 23 and a threaded bore which is engaged upon the reduced outer end 24 of the barrel 1, the spring 9 seating in the groovedgface 23. The other elements are retained and the action is precisely the same as above outlined.

A device constructed in accordance with the present invention is simple in its structural details, inexpensive to manufacture and practical and eiiicient in use.

What is claimed is: p 'lf The combination, in aftool of the class described, of a barrel, a flanged rivet die working therein, a memberv secured to and surrounding the barrel and provided with an outwardly curved seat, a sheet metal sleeve surrounding said member and having its opposite ends curved inwardly, its outer end being engaged with the flange on the die, said sleeve consisting f a pair of semiannular 'sections formedv with registering grooves, and having their adjacent edges interlocked with each other, a sheet metal clamping sleeve surrounding said sections and. formed with a circumscribing bead arranged to fit in said grooves, and an expansi-v ble -coil spring interposed between said.

member and sleeve and bearing at opposite ends against said seat and the curved upper end of said sleeve.

2. The combination in a tool of the class described, of a barrel, a rivet die 'working therein and provided with a flange, la sheet metal sleeve surrounding and secured to the barrel andhaving its outer end curved outwardly, a sheet metal sleeve surrounding the first named sleeve and having its opposite )metal clamping s L ends curved inwardly, its outer end being enga ed' with the ange on the die, an exe pensi 1e coil spring interposed between'said" sleeves and bearing at opposite ends against the curved inner end of the second named 4sleeve and the curved'outer end of the rjst named sleeve, saidv second named sleeve eon-` 'sisting of a pair of semi-annu1ar members cmscribing groove, a ianged die slidable therein, a s heet metal .sleeve surrounding outer end of the first4 named sleeve. said seothe barrel and lprovided Witha' crimped i inner end engaged in saidjgroovgand with an outwardly curved 'outer end, a Sheet metal sleeve surronnding thev first named eieeve and having its 'opposite ends curved inwardly, the outer e'nd enga the die fiange, andan expansibie c011- springinterpoaed between 'said sleeves and 'bearing' at opposite-ends against the eurved inner end of the second named sleeve and the curved In testimony whereof, I aix my signa-` ture, in presence of two witnesses.

Lorne e. FISCHER,

Witnesses: l

PAUL A.CUENAT, W. C; HUNSICKER. 

